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Evolution of Life

How these connect

Radiometric dating and what it relates to. Every line is an evidence-backed relation, and the arrangement is fixed — this address draws this picture, today and next year.

depends_on — A molecular clock has no absolute scale of its own and must be calibrated against radiometrically dated fossil horizons, inheriting their uncertainties.assesses — Whether a biotic loss counts as a mass extinction is a claim about rate, and rate can only be established by dating the boundary interval tightly enough to bound its duration.depends_on — The highest-precision deep-time ages come from uranium–lead in zircon, whose lattice accepts uranium and excludes lead so that essentially all daughter lead is radiogenic.Mass extinctionMass extinctionZircon as a geochronometerZircon as a geochronometerMolecular clock datingMolecular clock datingRadiometric datingRadiometric dating
4 drawn · 7 reachable and not drawn · positions derived from object ids, never from a simulation
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Every relation drawn, in words3
  1. Molecular clock dating · depends_on · Radiometric dating

    A molecular clock has no absolute scale of its own and must be calibrated against radiometrically dated fossil horizons, inheriting their uncertainties.

  2. Radiometric dating · assesses · Mass extinction

    Whether a biotic loss counts as a mass extinction is a claim about rate, and rate can only be established by dating the boundary interval tightly enough to bound its duration.

  3. Radiometric dating · depends_on · Zircon as a geochronometer

    The highest-precision deep-time ages come from uranium–lead in zircon, whose lattice accepts uranium and excludes lead so that essentially all daughter lead is radiogenic.